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Water Usage Calculator

Estimate your household's daily, monthly and yearly water use from showers, toilets, laundry, dishwasher and more.

Related tools

All Consumption & comfort tools →
Carbon Footprint CalculatorEstimate your yearly CO2 footprint from transport, home energy, diet and shopping.Electricity consumption calculatorWork out an appliance's energy use in kWh.Flight carbon footprint calculatorEstimate the CO₂ emissions of a flight from its distance.Heat index calculatorFind the 'feels-like' temperature in hot, humid weather.Wind chill calculatorFind the 'feels-like' temperature in cold, windy weather.

Open Water Usage Calculator and you get an answer straight away, with no account to create. Its place is under Consumption & comfort; Carbon Footprint Calculator and Electricity consumption calculator answer the questions closest to this one.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Water Usage Calculator?

Estimate your household's daily, monthly and yearly water use from showers, toilets, laundry, dishwasher and more.

When would I actually use this?

Putting a number on what something costs or feels like: an appliance's share of the bill, a flight's emissions, a household's footprint, or how cold the wind actually makes it.

What is the most common mistake?

Reading a nameplate rating as an average. A 2000 W appliance draws that at full load, not continuously — a fridge rated at 150 W runs a fraction of the hour, so its yearly cost is nowhere near 150 W times 8760.

How is Water Usage Calculator different from Carbon Footprint Calculator?

They sit next to each other but answer different questions: Carbon Footprint Calculator is the one to open when you need it to estimate your yearly CO2 footprint from transport, home energy, diet and shopping. Pick whichever matches what you're starting from — both are free.

Where do the figures come from?

The arithmetic is exact for the rating and tariff you enter. Emission factors come from published national inventories and differ by a factor of several between electricity grids, so a footprint is only as local as the factor behind it.

Further reading

All guides →
ExplainerWhere Household Water Actually GoesPeople picture taps and showers, and metered end-use studies say the biggest single line is somewhere else. Here is the ranked budget from named national agencies, plus the arithmetic that changes behaviour: the dripping tap, the running tap, and the shower flow rate at which a bath becomes the cheaper option.How-toHow Much Laundry Detergent to Use: Load Size First, Water Hardness SecondA normal medium load in a high-efficiency machine works out at 37 ml. Load size swings that threefold; water hardness only 1.28-fold — and the tool's hardness input carries no units at all. Here are the scales and the conversions it leaves out.ExplainerR-Values, U-Values, and What an Insulation Number HidesR and U are reciprocals, and the two markets that read this site use different ones in different units — so an R-value quoted without its system means nothing. Worse, the number on the batt is not the number your wall achieves, because the studs are a parallel path.How-toHow Much Tile and Grout You Actually NeedFloor area divided by tile area is the answer everyone reaches for, and it is always short. Count the grid instead, add the layout allowance, round to full boxes, keep attic stock — then derive the grout from the joint geometry rather than trusting the bag.ExplainerWind Chill: What the “Feels Like” Number Actually MeasuresThe calculator runs the 2001 index, not the 1945 one, and refuses to answer above 50 °F or under 3 mph. Here is what its number is a model of — bare skin, in shade, walking — and the two things it says nothing about: a clothed body, and a parked car.ExplainerHow Much Electricity Do Appliances Use? Watts, kWh and CostHow watts turn into kilowatt-hours, what typical appliances draw, and how to translate that consumption into a cost on your bill.